One of the key reasons we use desktop search is for speed in finding things. I've been using WDS since it's first release but I found that X1 was faster at finding things and displaying results and showing previews. I've also recently seen Copernic and it was much faster. I think a key issue here is speed, speed, speed, and if I didn't mention it speed! For example, OL 2007 now uses WDS. I find it terribly slow finding a contact name. I can find a contact faster on my Windows Mobile device. I expect my desktop, with it 1 GB of memory and 3GHz HT CPU to be faster at this stuff then my handheld.